Dunno about AO but I can assure you that you can have lots of either Infinite or Spot lights, or any combination thereof and reflections will work just fine. The only other thing I can think of is that your material settings for the floor are wrong and you're washing out the reflections. As mentioned above, please post a pic of the settings you are using for the floor. Otherwise, it's impossible to tell what the problem is.

Coppula eam se non posit acceptera jocularum.

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